JP2017518246A - Laminated glass including thin inner flat glass - Google Patents

Abstract

The present invention relates to a laminated glass for a vehicle for separating a vehicle interior space from an external environment. This laminated glass for vehicles includes at least an inner plate glass (1) made of glass having a thickness of 0.1 mm to 0.4 mm, an outer plate glass (2) made of glass having a thickness of 1.0 mm to 1.8 mm, and an inner plate glass. A thermoplastic intermediate layer (3) joining (1) to the outer glass sheet (2).

Description

  The present invention relates to a laminated glass comprising a thin inner glass sheet, a method for its production and use.

  Laminated glass is well known as glass fitted in the field of vehicles. The laminated glass is generally composed of two glass plates having a thickness of 2 mm to 3 mm, and these glass plates are bonded to each other by a thermoplastic intermediate layer. Such laminated glass is particularly used as a front window glass and a sunroof glass, but is also increasingly used as a side window glass and a rear window glass.

  Currently, the vehicle industry strives to reduce the weight of the vehicle and, accordingly, reduce fuel consumption. A significant contribution to this can be to reduce the weight of the glass that is fitted, which can be achieved in particular by reducing the thickness of the glass sheet. Such a thin glass sheet has a thickness of especially less than 2 mm. However, even if the thickness of the glass sheet is reduced, the requirements for the stability and breakage resistance of the glass sheet must be met.

  In the past, the general view was that in order to ensure sufficient stability and breakage resistance, both glass panes of laminated glass must not fall below a certain minimum thickness. According to US 2013/0295357 (US 2013/0295357 A1), for example, a laminated glass for a vehicle including a thin inner glass sheet is disclosed. In this case, the laminated glass includes an outer plate glass having a thickness of 1.5 mm to 3.0 mm, for example 1.6 mm, and an inner plate glass having a thickness of 0.5 mm to 1.5 mm, for example 0.7 mm, which has been chemically prestressed. It consists of. Laminated glass including a thin inner glazing is clearly considered to be insufficiently stable to meet safety requirements in the vehicle field.

  An object of the present invention is to provide a laminated glass having sufficient stability and breakage resistance so that it can be used in the vehicle field, although the thickness is further reduced, and thus the weight is further reduced. It is in.

  The object of the present invention is solved by the laminated glass according to claim 1 according to the present invention. Preferred embodiments are shown in the dependent claims.

  The laminated glass according to the present invention is preferably a laminated glass for vehicles (vehicle laminated glass). This laminated glass is provided in order to separate the internal space from the external environment in the opening, particularly in the window opening of the vehicle.

  The laminated glass (or laminated sheet glass) according to the present invention includes at least an inner sheet glass, an outer sheet glass, and a thermoplastic intermediate layer that joins the inner sheet glass to the outer sheet glass. The inner and outer glazings are preferably made of glass.

  In the present invention, the inner plate glass means the plate glass on the side facing the internal space (vehicle internal space) in the laminated plate glass. Moreover, an outer side plate glass is a plate glass of the side suitable for the external environment.

  The outer glazing preferably has a thickness of 1.0 mm to 1.8 mm. The inner glass sheet preferably has a thickness of 0.1 mm to 0.4 mm.

  In the present invention, the inner plate glass means the plate glass on the side facing the internal space (vehicle internal space) in the laminated plate glass. Moreover, an outer side plate glass is a plate glass of the side suitable for the external environment.

  The laminated glass having a thickness according to the invention with respect to the outer and inner glazings surprisingly has a high degree of stability and breakage resistance, in particular a high degree of scratch resistance and impact resistance. It has been found. In other words, the inner plate glass can be made to be significantly thinner than those generally employed so far. The stability and breakage resistance of the laminated glass is achieved by selecting the thickness of the outer glazing according to the present invention and configuring the thickness of the outer glazing and the inner glazing asymmetrically. Surprisingly, the laminated glass according to the invention fulfills a high safety requirement in the vehicle field. These requirements are typically verified by standardized tests for breakage, impact and scratch, for example by ball drop tests according to ECE Regulation No. 43.

  The thickness of the inner glass sheet is preferably at most 25% of the thickness of the outer glass sheet, particularly preferably at most 20%. The asymmetry thus configured is particularly advantageous with respect to the resistance of the glass sheet.

  The laminated glass according to the invention is particularly preferably an automotive front window glass.

  According to one preferred embodiment, the inner glazing is pre-bent glazing, i.e. tempered by a thermal bending process prior to lamination to form the laminated glass. Basically, the inner plate glass may be a plate glass that is not bent in advance, and since this plate glass has a small thickness, it is matched with the shape of the outer plate glass at the time of lamination. However, it is advantageous to use a pre-bent inner glass pane, especially when it is bent in so-called three dimensions in a plurality of spatial directions, because that way the desired shape is slightly visible. This is because it can be achieved by distortion. Since the bending process leaves a characteristic trace in the glass structure, one skilled in the art can distinguish between pre-bent and non-pre-bent by visual inspection.

  According to the present invention, the thicker outer glass sheet is bent in advance. The outer plate glass and the inner plate glass are preferably bent in advance while maintaining congruence, that is, these plate glasses have the same bent state in advance.

  The inner glazing can have a thickness of 0.1 mm, 0.2 mm, 0.3 mm or 0.4 mm, for example. The outer glass pane can have a thickness of, for example, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm or 1.8 mm.

  According to one particularly advantageous embodiment, the inner glazing has a thickness of 0.2 mm to 0.4 mm, preferably 0.2 mm to 0.3 mm, particularly preferably about 0.3 mm. Has a thickness of By doing so, particularly good results are achieved in that the weight of the laminated glass is reduced while having high stability and breakage resistance.

  According to one particularly advantageous embodiment, the outer glazing has a thickness of 1.4 mm to 1.8 mm, preferably 1.5 mm to 1.7 mm, particularly preferably about 1.6 mm. Having a thickness of This is particularly advantageous on the one hand in reducing the weight of the laminated glass, on the other hand, this thickness is sufficient to ensure sufficient asymmetry of the thickness between the outer and inner glazings. This, in turn, provides a high degree of stability.

  According to one advantageous embodiment of the invention, the outer glazing is a non-prestressed glazing. The outer glass sheet may be exposed to loads such as stone impact. If a stone hits the glass plate, especially if a small, pointed stone hits the glass plate, such a stone can penetrate the surface of the glass plate. If the plate glass is prestressed, it can cause stones to enter the tensile stress zone inside the plate glass, thereby causing the plate glass to shatter. If the outer glass pane is not prestressed, the compressive stress zone is wide and the internal tensile stress is reduced, thereby reducing the fragility of the pointed object to impact. Therefore, as a whole, the outer plate glass to which prestress is not applied is very advantageous in terms of the safety of the vehicle occupant.

  According to one preferred embodiment of the invention, the outer glazing is soda lime glass or borosilicate glass, in particular soda lime glass. Soda lime glass is available at low cost and has been demonstrated for use in the vehicle field.

  According to one advantageous embodiment of the invention, the inner glazing is a tempered glass that has been chemically prestressed and chemically strengthened. By pre-stress, damage resistance and scratch resistance can be particularly imparted to the inner glass sheet. In the case of extremely thin glass sheets, such as those provided as inner glass sheets according to the present invention, chemical prestress is better suited than thermal prestress or heat strengthening. Since thermal prestress is based on the temperature difference between the surface zone and the core zone, thermal prestress is premised on the glass plate having a predetermined minimum thickness. In general, if a commercially available thermal prestressing device is used, sufficient stress can be achieved at a glass thickness of about 2.5 mm or more. Generally, if the glass thickness is thinner than this, generally required prestress values cannot be achieved (see, for example, ECE Regulation No. 43). In the case of chemical prestress, ion exchange changes the chemical composition of the glass in the surface region, where ion exchange is limited to the surface zone by diffusion. Chemical prestress is therefore particularly suitable for thin glass sheets. For chemical prestress, the names chemical tempering, chemical hardening or chemical strengthening are also commonly used.

  The stability of the first glass sheet can be improved by appropriate values and local distribution of the stress caused by the incorporation of ions in chemical prestress.

  The chemically prestressed inner glazing preferably has a surface compressive stress greater than 100 MPa, more preferably a surface compressive stress greater than 250 MPa, particularly preferably a surface compressive stress greater than 350 MPa. Have.

  The compressive stress depth of the glazing is in particular at least one-tenth of its thickness, preferably at least one-sixth of its thickness, for example about one-fifth of the thickness of the inner glazing. This is advantageous on the one hand in terms of breakage resistance of the glass sheet and on the other hand in that the time taken for the prestressing process is reduced. In the present invention, the depth of compressive stress means the depth measured from the surface of the plate glass, and that the plate glass is subjected to a compressive stress greater than 0 MPa up to that depth. If the inner plate glass is, for example, 0.3 mm in thickness, the compressive stress depth of the inner plate glass is preferably greater than 30 μm, particularly preferably greater than 50 μm, and even more preferably 100 μm to 150 μm.

The inner glazing can basically have a chemical composition known to any person skilled in the art. The inner glazing may comprise or consist of, for example, soda lime glass or borosilicate glass. The inner glazing is preferably suitable for chemically prestressing, and particularly preferably contains an alkali element of an appropriate content, preferably sodium. The inner glass sheet may be, for example, 40 wt% to 90 wt% silicon oxide (SiO ₂ ), 0.5 wt% to 10 wt% aluminum oxide (Al ₂ O ₃ ), 1 wt% to 20 wt% sodium oxide ( Na ₂ O), 0.1 wt% to 15 wt% of potassium oxide _(K 2 O), 0% to 10% by weight of magnesium oxide (MgO), 0% to 10% by weight of calcium oxide (CaO) , and 0 wt% to 15 wt% of boron oxide _(B 2 _{O 3)} can contain. Furthermore, the inner glass plate may contain other components and impurities.

  Surprisingly, however, it has been found that the particular chemical composition of the inner glazing is particularly suitable for applying chemical prestress. This manifests itself in the speed of the diffusion process, and as a result, the time effort required for the pre-stress process is advantageously reduced, and the pre-stress depth (compression stress depth) is increased. A stable glass resistant to breakage is formed. Such a composition is preferable from the viewpoint of the present invention.

According to one preferred embodiment, the inner glazing comprises aluminosilicate glass. The inner glass pane is preferably 50% to 85% silicon oxide (SiO ₂ ), 3% to 10% aluminum oxide (Al ₂ O ₃ ), 8% to 18% sodium oxide (Na ₂ O), 5 wt% to 15 wt% of potassium oxide _(K 2 O), 4 wt% to 14 wt% of magnesium oxide (MgO), 0% to 10% by weight of calcium oxide (CaO), and 0 Contains from 15% to 15% by weight of boron oxide (B ₂ O ₃ ). Furthermore, the inner glass plate may contain other components and impurities. The inner glass sheet is particularly preferably at least 55% to 72% (more particularly preferably 57% to 65%) silicon oxide (SiO ₂ ), 5% to 10% (more particularly preferably 7%). % To 9% by weight) aluminum oxide (Al ₂ O ₃ ), 10% to 15% by weight (more particularly preferably 12% to 14% by weight) sodium oxide (Na ₂ O), 7% to 12% % By weight (more particularly preferably 8.5% to 10.5% by weight) potassium oxide (K ₂ O), and 6% to 11% by weight (more particularly preferably 7.5% to 9.5%). % By weight) of magnesium oxide (MgO).

  These preferred glass compositions offer other surprising advantages besides being capable of chemical prestressing. Such plate glass is suitable for bending together with plate glass made of conventional soda-lime glass (also referred to as standard glass) while maintaining congruence. This requires similar thermal properties so that both types of glass can be bent in the same temperature range, that is, in a temperature range of approximately 450 ° C to 700 ° C. As is well known to those skilled in the art, flat glass that is bent while maintaining congruence is special for joining them to form a laminated glass because their shapes are optimally aligned with each other. It is suitable for. Thus, an inner glazing having a preferred chemical composition is particularly suitable for use in laminated glass with an outer glazing of other compositions, particularly with an outer glazing made of soda lime glass.

  However, as another option, the inner plate glass may be a plate glass that is not prestressed. Especially in the case of extremely thin glass plates, the stress values achievable by chemical pre-stress become even smaller and thus the stabilizing effect becomes even smaller. If no prestress is applied to the inner pane, according to one preferred embodiment, the inner pane comprises borosilicate glass. It has been found that in this way particularly significant stability and breakage resistance can be achieved.

  The thermoplastic interlayer comprises at least one thermoplastic film, and according to one advantageous embodiment, the thermoplastic interlayer is formed by a single thermoplastic film. This is advantageous in that the structure of the laminated glass is simple and the overall thickness is thin. The thermoplastic interlayer or thermoplastic film preferably comprises at least polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), polyurethane (PU), or mixtures or copolymers or derivatives thereof for laminating glass. It was proved as.

  The thickness of the thermoplastic intermediate layer is preferably 0.2 mm to 1.0 mm. For example, a standard thickness thermoplastic film of 0.76 mm can be used.

  According to a particularly preferred embodiment, the laminated glass does not have a further glazing or polymer layer, i.e. consists only of an outer glazing, an inner glazing and a thermoplastic interlayer.

  The outer plate glass, the inner plate glass, and the thermoplastic intermediate layer can be transparent and colorless, but may be colored or colored. According to one preferred embodiment, the total light transmission through the laminated glass is greater than 70%, especially when the laminated glass is a front window glass. The term “total light transmittance” relates to the method for inspecting the light transmittance of a glass sheet for automobiles defined by ECE Regulation No. 43, Annex 3, Section 9.1.

  The laminated glass is preferably bent in one or more spatial directions, as is common with automotive glazing, where typical curvature is in the range of about 10 cm to about 40 m. However, the laminated glass may be flat, for example when it is used as a sheet glass for buses, trains or towing vehicles.

  The laminated glass according to the invention can have a functional coating, such as an infrared reflective coating or infrared absorbing coating, an ultraviolet reflective coating or an ultraviolet absorbing coating, a colored coating, a low emission coating, a heatable coating, a coating with antenna function , Debris bonding coating, or electromagnetic radiation shielding coating. The functional coating is preferably disposed on the outer glazing. The outer glazing, which is relatively thick and preferably made of standard glass, can be coated technically simpler and less costly than the significantly thinner inner glazing, for example by physical vapor deposition (such as sputtering). In particular, the combination of coating and chemical prestress is technically very difficult. Depositing the coating before pre-stress interferes with the ion diffusion process in the case of chemical pre-stress. Further, if coating is performed after chemical pre-stress, the stress distribution of the plate glass changes because the temperature is generally high. The functional coating is preferably disposed on the surface of the outer glazing facing the thermoplastic interlayer, wherein the outer glazing is protected from erosion and damage.

  Laminated glass can also be provided with additional functions, in which case, in addition to or instead of a functional coating, the intermediate layer contains a functional content, such as an infrared absorption property. , Inclusions having ultraviolet absorption properties, coloring properties, or acoustic properties. Inclusions are, for example, organic or inorganic ions, compounds, aggregates, molecules, crystals, pigments or dyes.

The present invention is further solved by the method for producing a laminated glass according to the present invention. in this case,
a) An inner plate glass, a thermoplastic intermediate layer, and an outer plate glass are arranged vertically in this order,
b) The inner plate glass and the outer plate glass are bonded to each other by lamination.

  If it is desired that the laminated glass be bent, at least the outer glass sheet is subjected to a bending process prior to lamination.

  According to one embodiment of the invention, the inner pane is not pre-bent. Because the inner glass sheet is extremely thin, the inner glass sheet has film-like flexibility and can therefore be matched to the pre-bent outer glass sheet without having to bend it in advance. it can. If it does in this way, manufacture of a laminated glass will become easy.

  According to an alternative embodiment, the inner glass sheet is similarly bent. This is particularly advantageous when it is strongly bent in a plurality of spatial directions (so-called three-dimensional bending).

  The outer plate glass and the inner plate glass can be bent individually. Preferably, the outer glazing and the inner glazing are bent together (ie simultaneously in time and by the same tool) while maintaining congruence. This is because, in this way, the shape of the plate glass is optimally aligned with each other for subsequent lamination. Typical temperatures for the process of bending glass are, for example, 500 ° C to 700 ° C.

  According to one preferred embodiment, the inner glazing is chemically prestressed. If necessary, the inner glass sheet is gradually cooled after being bent. If the cooling is too fast, a thermal stress is generated in the glass sheet, and the shape may change due to such a thermal stress when chemical pre-stress is performed later. The cooling rate is preferably 0.05 ° C. to 0.5 ° C. per second, particularly preferably 0.1 ° C. to 0.3 ° C. per second before being cooled to a temperature of 400 ° C. By gradually cooling in this way, it is possible to prevent thermal stress from being generated in the glass. Such thermal stresses in particular cause optical defects and adversely affect the chemical prestress that is performed later. Thereafter, the cooling can be continued, and the cooling rate can be increased. The reason is that if the temperature is lower than 400 ° C., the risk of thermal stress is reduced.

The chemical prestress is preferably carried out at a temperature of 300 ° C. to 600 ° C., particularly preferably at a temperature of 400 ° C. to 500 ° C. At that time, the inner glass sheet is treated with the molten salt, for example, immersed in the molten salt. During this process, especially sodium ions in the glass are exchanged by larger ions, in particular by larger alkali ions, thereby generating the desired surface compressive stress. The molten salt is preferably a potassium salt melt, particularly preferably a potassium nitrate (KNO ₃ ) or potassium sulfate (KSO ₄ ) melt, and more particularly preferably a potassium nitrate (KNO ₃ ) melt. .

  Ion exchange is determined by the diffusion of alkali ions. The desired values for the surface compressive stress and the compressive stress depth can thus be adjusted, in particular by the temperature and duration of the prestress process. Typical times for this period are 2 to 48 hours.

After the treatment with the molten salt, the plate glass is cooled to room temperature. The plate glass is then washed, preferably with sulfuric acid (H ₂ SO ₄ ).

  The thermoplastic intermediate layer is preferably prepared as a film. The production of laminated glass by lamination is performed by a general method known per se to those skilled in the art, for example, by an autoclave method, a vacuum bag method, a vacuum ring method, a calendar method, a vacuum laminator or a combination thereof. . In that case, joining of an outer plate glass and an inner plate glass is generally performed under the action of heat, vacuum and / or pressure.

  The invention further includes the use of the laminated glass according to the invention in motor vehicles, preferably in motor vehicles, particularly preferably in private cars, in particular used as front window glass, side window glass, rear window glass or sunroof glass. .

  Next, the present invention will be described in detail with reference to the drawings and examples. The drawings are schematic and are not drawn to scale. Further, the present invention is not limited by the drawings.

Sectional drawing which shows one embodiment of the laminated glass by this invention Flowchart showing one embodiment of the method according to the invention

  FIG. 1 shows a laminated glass according to the present invention, which is composed of an inner sheet glass 1 and an outer sheet glass 2, which are joined together via a thermoplastic intermediate layer 3. The intermediate layer 3 is formed of a single film made of PVB having a thickness of 0.76 mm. Laminated glass is provided as a front window glass of an automobile. This laminated glass is bent three-dimensionally, as is common for automotive front window glass. That is, in this case, the plate glass is bent in a plurality of spatial directions, particularly in the horizontal direction and the vertical direction. However, for easy viewing, the laminated glass in the drawing is drawn roughly flat.

  Regarding the laminated glass according to the present invention, the thickness, glass material and prestress of the inner plate glass 1 and the outer plate glass 2 are summarized in Table 1 (Examples).

  In this case, the stability of the laminated glass according to the present invention was determined by a standardized test, and the result was compared with the result of a laminated glass having a conventional thickness (see Comparative Example, Table 1).

Stability of stone (pointed stone) against impact A projectile with a diamond tip was dropped onto the laminated glass (Example) of the present invention with increasing height to simulate the impact of a pointed stone. At that time, the height when the laminated glass was broken was measured. When it collided with the outer glass plate 2, breakage of the glass was observed at a height of 1400 mm. Surprisingly, it was shown that the laminated glass according to the present invention having a remarkably thin glass is more resistant to stone impact than the conventional comparative example (the glass breaks at a height of 1100 mm).

Ball drop test according to ECE Regulation No. 43 This test was performed on a 30 cm × 30 cm specimen. In the first test, a steel ball having a weight of 227 g was dropped onto the outer glass sheet 2 from a height of 8.5 m. This test simulates the stone colliding with the laminated glass from the outside. This test is considered to have passed if the sphere was blocked by the laminated glass and did not penetrate the laminated glass, and the amount of debris released from the side opposite the impingement surface (in thickness) This is the case when the amount is below a predetermined amount. A comparative example with a combination of glasses that has been demonstrated for front window sheet glass passed this test as expected. Surprisingly, however, the laminated glass of the present invention according to the thin glass examples also passed this test. On the contrary, there are fewer pieces delaminated from the inner glass sheet 1 at the time of the collision, which can be evaluated as advantageous for the safety of the vehicle occupant.

  In the second test, a steel ball having a weight of 2260 g was dropped onto the inner glass sheet 1 from a height of 4 m. This test simulates the occupant's head colliding with the laminated glass. The test is considered to have passed if the sphere was blocked by the laminated glass and did not penetrate the laminated glass within 5 seconds after failure. The comparative example with thick glass passed this test as expected. However, the laminated glass of the present invention according to the example having a thin glass thickness also passed this test.

  The laminated glass according to the present invention has a very small weight because the glass is extremely thin. Moreover, as the test shows, this laminated glass is excellent in that it has high resistance to breakage and impact resistance by stone. This laminated glass in particular meets the high safety requirements for laminated glass in the vehicle field and can therefore be used, for example, as a windshield. In particular, very thin inner panes can be used for vehicle panes. Such a result is unexpected and surprising to those skilled in the art.

  As another option, the inner glass sheet 1 may be made of borosilicate glass that is not prestressed. In this case, it was found that such a glass combination (outer plate glass 1.6 mm, soda-lime glass not prestressed; intermediate layer 0.76 mm, PVB; inner plate glass 0.3 mm, prestressed Even borosilicate glass) can achieve significantly better results with respect to stability and breakage resistance.

  FIG. 2 shows a flow chart of one embodiment of a method according to the invention for producing a laminated glass according to the invention. The inner plate glass 1 and the outer plate glass 2 are prepared in a flat initial state. A process of bending the inner glass sheet 1 and the outer glass sheet 2 together is carried out, and they are bent while maintaining congruence so as to obtain a final three-dimensional shape.

  As an option, after the inner glass sheet 1 is bent, a chemical prestress is applied to the glass sheet. For this purpose, the inner glass sheet 1 is bent and then gradually cooled to avoid thermal stress. A suitable cooling rate is, for example, 0.1 ° C. per second. The inner glazing 1 is then treated with a potassium nitrate melt at a temperature of 460 ° C. for a period of several hours, for example 4 hours, thereby being chemically prestressed. By this treatment, exchange based on the diffusion of sodium ions and larger potassium ions through the glass surface is performed. This creates a surface compressive stress. The inner glass sheet 1 is then cooled and washed with sulfuric acid to remove potassium nitrate residues.

  Thereafter, a thermoplastic intermediate layer 3 is disposed between the inner plate glass 1 and the outer plate glass 2. The laminated body which consists of the inner side glass plate 1, the intermediate | middle layer 3, and the outer side glass plate 2 is joined by lamination, for example, by a vacuum bag method as usual.

1 inner plate glass 2 outer plate glass 3 intermediate layer

Claims (15)

A laminated glass for a vehicle for separating a vehicle interior space from an external environment, the laminated glass for a vehicle at least,
An inner plate glass (1) made of glass having a thickness of 0.1 mm to 0.4 mm;
An outer plate glass (2) made of glass having a thickness of 1.0 mm to 1.8 mm;
A thermoplastic intermediate layer (3) joining the inner plate glass (1) to the outer plate glass (2);
The thickness of the inner plate glass (1) is at most 25% of the thickness of the outer plate glass (2).
Laminated glass for vehicles. The laminated glass is a front window glass,
The laminated glass for vehicles according to claim 1. The inner plate glass (1) is a pre-bent plate glass,
The laminated glass for vehicles according to claim 1 or 2. The inner plate glass (1) is a plate glass chemically prestressed,
The laminated glass for vehicles according to any one of claims 1 to 3. It said inner plate glass (1) comprises aluminosilicate glass, preferably 55 wt% to 72 wt% of silicon oxide _(SiO 2), 5 wt% to 10 wt% of aluminum oxide _{(Al 2} O 3), 10 weight % To 15% by weight sodium oxide (Na ₂ O), 7% to 12% by weight potassium oxide (K ₂ O), and 6% to 11% by weight magnesium oxide (MgO),
The laminated glass for vehicles according to claim 4. The inner plate glass (1) is a plate glass that is not prestressed, and includes borosilicate glass.
The laminated glass for vehicles according to any one of claims 1 to 3. The inner glass sheet (1) has a thickness of 0.2 mm to 0.4 mm, preferably about 0.3 mm;
The laminated glass for vehicles according to any one of claims 1 to 6. Said outer glazing (2) has a thickness of 1.4 mm to 1.8 mm, preferably 1.5 mm to 1.7 mm, particularly preferably about 1.6 mm. ,
The laminated glass for vehicles according to any one of claims 1 to 7. The outer plate glass (2) is a plate glass that is not prestressed, and preferably contains soda-lime glass.
The laminated glass for vehicles according to any one of claims 1 to 8. The intermediate layer (3) is formed by a single thermoplastic film, and the intermediate layer (3) is preferably at least polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), polyurethane (PU), or Including mixtures or copolymers or derivatives thereof,
The intermediate layer (3) preferably has a thickness of 0.2 mm to 1 mm,
The laminated glass for vehicles according to any one of claims 1 to 9. A functional coating is applied to the surface (II) of the outer plate glass (2) facing the intermediate layer (3), and the functional coating is preferably an infrared reflective coating or an infrared absorbing coating, an ultraviolet reflective coating. Coating or UV absorbing coating, colored coating, low emission coating, heatable coating, coating with antenna function, debris bonding coating, or electromagnetic radiation shielding coating,
Or
The intermediate layer (3) contains a function-containing material having infrared absorption characteristics, ultraviolet absorption characteristics, coloring characteristics, or acoustic characteristics, preferably organic ions or inorganic ions, compounds, aggregates, molecules, crystals, pigments or dyes. including,
The laminated glass for vehicles according to any one of claims 1 to 10. In the manufacturing method of the laminated glass for vehicles of any one of Claim 1 to 11,
a) The inner plate glass (1), the thermoplastic intermediate layer (3), and the outer plate glass (2) are arranged vertically in this order,
b) The inner plate glass (1) and the outer plate glass (2) are joined to each other by lamination.
A method for producing laminated glass for vehicles. Bending the inner glass sheet (1) and the outer glass sheet (2) together;
The method of claim 12. Chemically prestressing the inner plate glass (1) in a bent state,
14. A method according to claim 12 or 13. The laminated glass for a vehicle according to any one of claims 1 to 11 is used in an automobile, preferably in a private car, and particularly used as a front window plate glass, a side window plate glass, a rear window plate glass, or a sunroof plate glass. To
Use of laminated glass for vehicles.

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